A New Method of Estimation of Iodides
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Date
2011-11-22T06:52:45Z
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Abstract
The Reaction Between Chromic Acid and hydriodic acid has been employed in devising a method for the estimation of iodides in iodized salt. This reaction is show at low concentrations of dichromate (0.01-0.001N) but is catalysed by oxalate ions1. scince this reaction is stoichiometric with respect to both chromate and iodide, iodine is quantitatively liberated,if chromate is taken in excess. The excess dichromate is reduced by the addition of excess of ferrous ammonium sulphate and the ferric iron formed is removed by the addition of a large excess of oxalate2 which also catalyses the reaction between dichromate and hydriodic acid.
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Iodides